Ha, that's funny, I abandonned lilypond precisely to create combined stave/tab scores more easily. I found that flipping back and forth between the lilypond "source" and the rendered result was too slow. I read music notation much better than lilypond's "musical LaTex" notation and I found it hard to remember the nuances each time I came back to it. (Adding lyrics to an existing piece was the last straw).

I switched to Musecore. Although I generally eschew GUI apps I much prefer it to LP: I can see my editing changes directly without the "compile, run" steps. My efforts are less DRY, to continue the programming metaphor (eg copy/paste the chorus) but that's acceptable. I don't plan on writing any massive symphonies. As @rekado elsewhere on this page, I don't have to act-as-programmer when I'm making music.

Musecore has had lots of criticism of its design but that area has apparently improved a lot recently. It might be "Word for music" but it's a mostly-complete-but-simple version (so... Word 6? AbiWord?). Works for me.